atom/static/select-list.css

.select-list ol {
  border: 1px solid #212121;
  max-height: 300px;
  position: relative;
  overflow: hidden;
}

.select-list ol:empty {
  margin-bottom: 0;
  border: none;
}

.select-list ol li {
  padding: 10px;
}

.select-list ol li:after {
  content: ".";
  display: block;
  clear: both;
  visibility: hidden;
  height: 0;
}

.select-list li .label {
  display: inline-block;
}

.select-list li .right {
  float: right;
}

.select-list .key-binding {
  border-radius: 2px;
  margin-left: 5px;
  padding: 3px;
  font-size: 11px;
}

.select-list ol li:last-child {
  border-bottom: none;
}

.select-list .editor {
  margin-bottom: 5px;
}

.select-list .error {
  font-weight: bold;
  color: white;
  text-shadow: 0 1px 0 #4E0000;
}